Written with LLM assistance.Details at end. Ever wondered what happens when you hit that compile button on Compiler Explorer? Last week I was looking at our metrics dashboard, and then I realised: we now do 92 million compilations a year. That’s 1.8 million a week…for a site that started as a hacky way to justify to my boss that it would be OK to turn on C++17 features1, that’s not bad. I thought it might be fun to share how this all works. Not just a high-level summary, but some of the details ...